The delsey helium sky (carry-on) is at a very good price right now. I have a delsey bag. It is "middle of the road" quality. But, it is well designed and durable enough. It's been around quite a bit and is still working. This bag on sale now is a good budget-stretching find.
I have used Delsey suitcases for years and have been happy with their performance. I do not use them to go to Europe where I use a RS carry-on. One of my Delsey suitcase had a malfunction so I checked the warranty card and found that the item was still covered. I contacted Delsey and they gave me the name of a local place to take the item in for repair. When I picked up the repaired item I was told that there we no cost since it was covered by waranty.
Good customer service.
I have 2 Delsey suitcases. My lime green one is a carryon which is my go to for every trip. That bag has a lot of miles on it and is still in great shape. My other bag is a hard side Delsey. I've only used that 2x. I have an upcoming 10 day trip to Paris and Normandy and the smaller one is the one I will be taking. You can't go wrong with a Delsey :)